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Currently we have disabled IPv6 support in libjingle, but
there is effort going on to support it. This is the one of the first step in that process.

TBR=sergeyu@chromium.org
BUG=https://code.google.com/p/webrtc/issues/detail?id=1406

Review URL: https://codereview.chromium.org/30193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233473 0039d316-1c4b-4281-b951-d872f2087c98